In the evening, officers assigned to the DeConcini crossing searched a Nissan sedan and questioned Luis Enriquez Gonzalez-Murillo, 21, of Hermosillo, Sonora, Mexico.

CBP said officers found 14 pounds of meth and three pounds of heroin inside the gas tank and rear seats of the Nissan thanks to a drug-sniffing K-9. The meth was estimated at $42,500 and the heroin at $46,500.

"I am very proud of our officers' efforts," Tucson Field Office Director William K. Brooks said in a statement. "The amount of narcotics interdicted in such a short period is a testament to their dedication of keeping our communities safe."

The alleged smugglers were referred to U.S. Immigration and Customs Enforcement's Homeland Security Investigations.